In case anyone searches this in the future, it seems you can draw French Curves in Sketch Up, but it requires a plug in. I've just downloaded the plug in (Bezier Spline Tool Set on the SketchUcation website, choose Catmull Tool) and it works fine.
Interesting because there's another new Sketch Up development in the works (http://www.finewoodworking.com/item/110 ... ect-plugin) that will make it much easier to print out plans and templates to a precise scale, so you can design and print a ready made template for say a serpentine jewellery box or a serpentine drawer front without "lofting" it from a scale drawing.
